locale/lc-time.c

   1 /* Define current locale data for LC_TIME category.
   2 Copyright (C) 1995, 1996 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <libc-lock.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <time.h>
  24 #include "localeinfo.h"
  25
  26 _NL_CURRENT_DEFINE (LC_TIME);
  27
  28 /* Some of the functions here must not be used while setlocale is called.  */
  29 __libc_lock_define (extern, __libc_setlocale_lock)
  30
  31
  32 static int era_initialized;
  33 static struct era_entry **eras;
  34 static size_t num_eras;
  35
  36
  37 static int alt_digits_initialized;
  38 static const char **alt_digits;
  39 static size_t num_alt_digits;
  40
  41
  42 void
  43 _nl_postload_time (void)
  44 {
  45   /* Prepare lazy initialization of `era' and `alt_digits' array.  */
  46   era_initialized = 0;
  47   alt_digits_initialized = 0;
  48 }
  49
  50
  51 struct era_entry *
  52 _nl_get_era_entry (const struct tm *tp)
  53 {
  54   struct era_entry *result;
  55   size_t cnt;
  56
  57   __libc_lock_lock (__libc_setlocale_lock);
  58
  59   if (era_initialized == 0)
  60     {
  61       size_t new_num_eras = _NL_CURRENT_WORD (LC_TIME,
  62                                               _NL_TIME_ERA_NUM_ENTRIES);
  63
  64       if (eras != NULL && new_num_eras == 0)
  65         {
  66           free (eras);
  67           eras = NULL;
  68         }
  69       else if (new_num_eras != 0)
  70         {
  71           if (num_eras != new_num_eras)
  72             eras = realloc (eras, new_num_eras * sizeof (struct era_entry *));
  73
  74           if (eras == NULL)
  75             num_eras = 0;
  76           else
  77             {
  78 #if __BYTE_ORDER == __LITTLE_ENDIAN
  79               const char *ptr = _NL_CURRENT (LC_TIME, _NL_TIME_ERA_ENTRIES_EL);
  80 #else
  81               const char *ptr = _NL_CURRENT (LC_TIME, _NL_TIME_ERA_ENTRIES_EB);
  82 #endif
  83               num_eras = new_num_eras;
  84
  85               for (cnt = 0; cnt < num_eras; ++cnt)
  86                 {
  87                   eras[cnt] = (struct era_entry *) ptr;
  88
  89                   /* Skip numeric values.  */
  90                   ptr += sizeof (struct era_entry);
  91                   /* Skip era name. */
  92                   ptr = strchr (ptr, '\0') + 1;
  93                   /* Skip era format. */
  94                   ptr = strchr (ptr, '\0') + 1;
  95
  96                   ptr += 3 - (((ptr - (const char *) eras[cnt]) + 3) & 3);
  97                 }
  98             }
  99         }
 100
 101       era_initialized = 1;
 102     }
 103
 104   /* Now compare date with the available eras.  */
 105   for (cnt = 0; cnt < num_eras; ++cnt)
 106     if ((eras[cnt]->start_date[0] < tp->tm_year
 107          || (eras[cnt]->start_date[0] == tp->tm_year
 108              && (eras[cnt]->start_date[1] < tp->tm_mon
 109                  || (eras[cnt]->start_date[1] == tp->tm_mon
 110                      && eras[cnt]->start_date[2] <= tp->tm_mday))))
 111         && (eras[cnt]->stop_date[0] > tp->tm_year
 112             || (eras[cnt]->stop_date[0] == tp->tm_year
 113                 && (eras[cnt]->stop_date[1] > tp->tm_mon
 114                     || (eras[cnt]->stop_date[1] == tp->tm_mon
 115                         && eras[cnt]->stop_date[2] >= tp->tm_mday)))))
 116       break;
 117
 118   result = cnt < num_eras ? eras[cnt] : NULL;
 119
 120   __libc_lock_unlock (__libc_setlocale_lock);
 121
 122   return result;
 123 }
 124
 125
 126 const char *
 127 _nl_get_alt_digit (unsigned int number)
 128 {
 129   const char *result;
 130
 131   __libc_lock_lock (__libc_setlocale_lock);
 132
 133   if (alt_digits_initialized == 0)
 134     {
 135       size_t new_num_alt_digits = _NL_CURRENT_WORD (LC_TIME,
 136                                                     _NL_TIME_NUM_ALT_DIGITS);
 137
 138       if (alt_digits != NULL && new_num_alt_digits == 0)
 139         {
 140           free (alt_digits);
 141           alt_digits = NULL;
 142         }
 143       else if (new_num_alt_digits != 0)
 144         {
 145           if (num_alt_digits != new_num_alt_digits)
 146             alt_digits = realloc (alt_digits, (new_num_alt_digits
 147                                                * sizeof (const char *)));
 148
 149           if (alt_digits == NULL)
 150             num_alt_digits = 0;
 151           else
 152             {
 153               const char *ptr = _NL_CURRENT (LC_TIME, ALT_DIGITS);
 154               size_t cnt;
 155
 156               num_alt_digits = new_num_alt_digits;
 157
 158               for (cnt = 0; cnt < num_alt_digits; ++cnt)
 159                 {
 160                   alt_digits[cnt] = ptr;
 161
 162                   /* Skip digit format. */
 163                   ptr = strchr (ptr, '\0') + 1;
 164                 }
 165             }
 166         }
 167
 168       alt_digits_initialized = 1;
 169     }
 170
 171   result = number < num_alt_digits ? alt_digits[number] : NULL;
 172
 173   __libc_lock_unlock (__libc_setlocale_lock);
 174
 175   return result;
 176 }